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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f82ae1e0aaf3fb4092c84f5a673a520ab6c2ad6d3da2a6d81fa798b85fcd15e' 
  AND token = '1ELDV9U6lVDuqZG1Ar/ZPbeQ6SEh9gMsHR4Y3Z9OAPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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