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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e6edd6ffb7dd012bc6bed8df9e6fccc414b31de2fa8812aedef4ba6d33ced8' 
  AND token = 'A6JVWmvDI0Gg7NMw4kUN1g3SA/Iu7i6IvTgoB9Xs/0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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