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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c1533f3a9a0e3564ca98a4d8daa94b635b0f93a6a76df788e9cdd17641a797' 
  AND token = 'AQclIDZqahUsXM6hiWGvXF2BENUZs0Jzv69tibMBHX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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