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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d354506484a0ec444716ecc7ea314f224c6e6aed32f64440d91b62c4a7fe417' 
  AND token = 'prt3uCRIH57QGpqepwL1gSkeqXwTMO8KVbyhRDo4br0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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