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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0fa20f879772b8dff39e37978fe8e475ad1deefd871f7b64dfb3178d0145a8' 
  AND token = 'E24+9AeKH1ls56pOzwAC2JtdyU8XbrRd3yDencOWpns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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