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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cdc89ded89ff1daaac6c41a25276a539b4788154c13eeec10a2d0b63e8445e' 
  AND token = 'jk8Kmz30pnQw1pq05es6rVyOP+fpZ6tRQbJshr94dAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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