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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d83cf3656d94e7785b9b906be3218dfbcada4c3d4fe1da03b224244c471c9d' 
  AND token = 'w0r7IGZB4ovmt1eaMGZotK4sStlgFTNhdtVkdUVhqUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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