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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bcc2bd771ac0cc8e8e7a33ff474a7ee65f4ee9bcb5f64158a49dfc4ecf5385' 
  AND token = 'NY30XJSVVzZGP42qdgeUHPLf6nHUbOLlarwHuz42VtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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