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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95881c6b7a9a62e17eaccdd5c7393e02191dd75d1b46f44d496b7766e3526d67' 
  AND token = 'u/TC7aIfvt6KLqZ73vOioXs5Zj4Th3b6FgFm3AeyXSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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