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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30162d10cc486e785422920627a743b11935f9c05f5ad5a09360cebdf9ac28b' 
  AND token = 'sFDjzOiYSb0799epD7a8VuasUnDPBnMKUvoVIvaP0aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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