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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f16825764f08930130ccc50a29dd963d45e2f8ef5e666d943945216665bcf4' 
  AND token = 'Nt4+Wc4TVNUW1GKRsO1akmOZ7KIRWxuHkblPBt2QiJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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