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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c08c3346c1880321fdb3c0aa14d2480681c25517f1cc4f41a106b2873cbb5c5' 
  AND token = 'i3lh3w2RQa4K52oNJMWYQwxDeo2Mui9SAhXgI3cf/fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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