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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef96e2e668481ce07b90086011ef7266e119aad5888cb7aaa2d76da5c3497501' 
  AND token = 'dm93MNxF7WTFTIgYB3bCQFOuyhATW0m0xOQZxMtLyoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}