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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23bf2a51c3cd7946b5e64ee50de017c6ca15014db6344bc4c9643523f459108' 
  AND token = 'CEntZJ2VpdnafEKqZ9pL1YkCb8Gi9wOnbMvCa3mcKHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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