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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d671c591a0414bd23c37bc1a68b5d8d46612c9dd2f203024ff493a0033a0eab' 
  AND token = '/d7qQFcLXagCsee9HykteFK+t+50IuyO2zmD/pWSUUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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