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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea992fed0cdfb443f9b66b5e52863fb8fa93b1363fbc7424698171e49935aac7' 
  AND token = 'UhX3SADvDe2jfnBxd0Z5s4yvX1FGbVO+5J89pxjtMDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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