SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11baf2218ef108d58b539b964cb4edc26a9894939d2796dbee699429967296fd' 
  AND token = '+3DQA0Mf3MIKvGqB2XvNWDiL+CszJ06LYwQFZHrdrt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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