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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6fd3fbc816a0b9e7d2fdc8570b549d617245ef89c10762a362e5d4036e7765' 
  AND token = 'fxv6VLgL0vr89BJQrxUmA7tuVIXr1Vwni2uAJz06uoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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