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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8eac232b35be0aeca413acb8106c94bc18312765f08d52bf75d67e656d2e8d' 
  AND token = '7fdwAdO2uK+0LmFUHELdhWR9zWwb699ZLON5PJ04Jro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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