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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa4c41d002da9ba9e4369d43021a814002af0f13f8aeeee9926427dc519bebb' 
  AND token = '9/T5a6Z3s8V+ESMRnr9RMu33fAmcVSmRJkgDsrbgGSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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