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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a006b7e384b370880452f924d91abc47cceb0646dfb574a2d4a7787e66a23ac' 
  AND token = 'ea2bhxXwpTM6pYKFEXrFduz+ipjDM8kqxF93A7UE3+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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