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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb72c945f48a073a4e08cdf0b05beaa8c2abf280f841256ff1ca3869d67fbaa' 
  AND token = 'a+T7uSz+6MQl5XPIVuiDn9YeTgLX/sgG2fYl0IBDlSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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