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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06318a4155ca8f11bd4fe282756db1d99a89d2fb668d8888e6ee085ae1a8295' 
  AND token = 'dtW+b0wxsnmzYZk4sZ9qoNtStG05/nCHlY2NjNWUiPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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