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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42cd3ea0f01a95fb24e0fc8f77b3745d8564369fbba508820c1fdb84e858ff9' 
  AND token = 'lri/KHstwGlJkarYGz1KAWBu1KTk741F7UZBLkR3XbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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