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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46f1a653628fe4a75808221a10b1835d0aee290b25b6e1a0ab0426356038e1d' 
  AND token = 'GODAhBTAYQSWvVElnFFGJG9C9ZZgWYK1h34epohpQIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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