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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aeecf79fdd0f3e483ca653c31a16092e49aaf66f96f300604464f5909a169f7' 
  AND token = 'wfBnJKbolOdD3QL+6Lii8/IJpVcVlAOVhg20xV1yKyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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