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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5600ad08506cad806a1fa9a51ca35bd9242dc5577656e508578ddfef4d60a03a' 
  AND token = 'm5YltP68JwkKoXPNq/3JUMgLbn+unrqaoiuJxhGM1aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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