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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce98e734d31720820dde164513e675e68325c9799b44f819a9cb4f8fe7ed5735' 
  AND token = 'toXj/LESwTQf2yzMoj0e6CAe4Iw6X7LxmXUtva2eB7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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