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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91a73e8c0d6152254b966955c6709708150ac3383de20c890aad8ee061fbd88' 
  AND token = 'KQx4ZsXyS+6dTvYV7WdXXYXfNj5yuqzsqUHyZ/bK4nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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