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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa13e1eb8942e35e5c5f96197ebf85b51088dbae2ae1c9d22d2d86b03cfe887' 
  AND token = 'j+765K78L4pA4/edwciltpD/IEpAarQhPQ3l/HumW9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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