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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95200612be4b0a06265ff8a74824bd3b95d5272b2c1d4f8c17dba8cbbdd4f28b' 
  AND token = 'CZUYX1QuA38i/tkLM4TOyK7qCGKbFBkDQzUj9nP0EEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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