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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d84ae8effe69c1ff4fe321bef865048c5e62f95f027dcb32c2b5600710357c' 
  AND token = 'uzii8yzMVm+W8PRBPfB+7B4f74VqwJ7ygO59zO9h1/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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