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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2995fd331d57a5d0a537afa6119c4069b0d6d8a5d7640d9bb6683f56c821360c' 
  AND token = 'pHtXHxePBfo7cJ82Apn+2QHtHFBWWw1ibrmFTg23O6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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