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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70799069908faf251e2d520523737bfe9030ba64cc67632f18bda9bf3a716ddc' 
  AND token = 'cDaN8ysidUWOHVLQ9P7vv9ZkJdHSlxn+GDTvD3tAcO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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