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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f13bfc94638fa93b4a3bb4135e547b23c6822d12aadfa814607bdf0cfe78c61' 
  AND token = 'n7habDWirCVlWI97ci/CAVXl1mlqOQ1X5wD2u2qnODg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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