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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04a93fad99879272ad852690824a7c5e428e51b69a2af9e0295a03fe39d4c68' 
  AND token = 'Xb0mQU02Z33TjkSCjRSUClqhgrpf3U2gCi4T9xd5Y8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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