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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae185da9d33426bd65ceffaaf9fed1d9cd33c995710bcd236117d02ce08d5175' 
  AND token = 'O4DvpHKKBfoiLVq5Li1DMwb7WELG/335C9iZfhgprs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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