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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a1ea03c9337adc1540a6c12443c94cf01d60d49c540af49ca0f8d2a9405f71' 
  AND token = 'SM8qvYUb/OMDGLMAya6EbYyGMd6aLN8pTFxhs+Ztlio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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