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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eab5b4f2e4d7f9ecf9c692b331cbb0209904dc5ba5ea5a4e45a978cc0249c5b' 
  AND token = 'b6+Bsm4OxzLBotr9c8o2jux4m4UjGNc/oi0ILdqo390=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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