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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53e3e3f7f718f4ebb9bc8fae9863bec6ea94f1e5948e81c746b2aeacb11c7b0' 
  AND token = 'ujbzZsHyamfGk5sWsLawz9dMbaS0KV4OHw4VpXmJ0e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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