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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0333f3828daf51b7295b24d7b9b7669a112c0571ea244784569b0fdfc8221c6e' 
  AND token = 'yxeOZbsz6Nf7pdQ82oJftKvv9uezyG6/AkgZAaOJPUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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