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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a9df2f34d1e53397c823b2eca3e653422e7d2a7a5604e527c7f19b58a69d21' 
  AND token = '0YFRd185tlrerEzO93nKgJ2NbELWRm/xZzAgs/u/2fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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