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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc15783328559a292b60691f0ee1168432e80b5a8aaf25f0e7fd6be3cf97f16' 
  AND token = 'WJikmofaql8lIhfdrofC0cWbR11b4YZjThodJ0N3cWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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