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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b4093b029f2d4d64ddbd3eadf1253d79899e1b983801f67782b58a0e499aa9' 
  AND token = 'FrlzvTHPbd4nP9ThYVfat8BcaMBcNedePO3S8xMWwoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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