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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17afa4cf8ac275090f738c8cec07098eb94a8160db899dc47d941fdbcb0a323' 
  AND token = 'SNZmA7t8WJsnd7aBMJ2Nzt7bDKUzoR3O4LJ3zP91NPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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