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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196c3d767e2d4bba8d240e153da930e18420094da8356a4292353dc33ff09bf4' 
  AND token = 'Ah3TdM2ok0LOL2xd+vXKh5IzBdPoIh0nDK+WR1Bjp98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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