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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ce8ec279dcad1450b84dc3c155be41ad37ad4096b6daefa6646c6c3cd683b1' 
  AND token = '5lIXaN5mNcMwKs4HfwDTj/05ved+/g3ozA85eSS5Jw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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