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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688004847553b2ed74cce7a5107e7d096bf1e58b35b5cfe0503f4651e5988fb6' 
  AND token = 'AT59TQccDOk/swD3KmmDxI77OBIh29UTlbv+jXSgPt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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