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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b734985d4fdfeb934db5cd0851a48a52c4a5ba72cdfc57dd6fba6922bb41aeb3' 
  AND token = 'vafA+7Lb2GKPY9bENi7thC3s3ia1TkEVgU6OY8uiD/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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