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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4a4fef1338cc6da6fd7c3f9eb922b507097a819a3d596a7e61662f1beddf3d' 
  AND token = 'HwzAVJ1y4h0SNiK0vIhvTs280vEGHItUSD+YdANxQ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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