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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12784234fa64611cbb9d2cbcb6a3faa7fbe3569af484e4cc87ff78db1a54816d' 
  AND token = 'wB7nC6Ovmc9RMyvtibLl2Li512UVPYUfgfHkpc2ui6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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