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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f9567ce3921d47ca248a363653327f7bbace81fa1aa6211b288ba6fd0d9261' 
  AND token = '6ulzGUXW1c1fWbcUFlfE6X5CohQYg0ZN5dkrK8KMvPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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