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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db427c58700c373137b2cad0b5623f3430dd8ba23b0b3096a2e000b941b33fb' 
  AND token = 'AmHTYC0MiCVUjeWQFymBKvxcbcd0L30ApvkaaOWN1tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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