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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69db4af53af0601ab0d30a10de4f47202f58754e3dc87ef11b339b8ca68ba2e' 
  AND token = 'l+/onuFYCpb28l8l5Tb4i5cEq7EaLlHYFhqX+Q2etSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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