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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1673d0c7652915dbb3cc80a1829a5cfe18f7cb6f42b1624b7b2b337cbaf0fd' 
  AND token = 'Iqu6zIxedsp8JKRhNf7O973RYTewtBpnc1oOiZX3Pho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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