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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f58a3bade47f0c5de3877d3df168a62ce9deb2f5cdbbb8247f14056841beab7' 
  AND token = 'EPpKKEmmvlapZoPGfDbFm86DiFTr+lZW5fk7ilLgNcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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