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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fdb34a07fd577b05fede3c07b9014b6ab926a398e0580cf8f93f7b8ff4a8fc' 
  AND token = 'bO3ub50KxCMKR/OkzQ4hvS7fc0JAJuUxPWcPZS/d3YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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